Backtracking
[计] 回溯法
🗣️ 情景例句
How was your flight?
旅途愉快吗？
As the touchstone tries gold,so gold tries man.
试金之石可试金，正如黄金能试人。
but ten months later, she received a letter from a girl in Holland.
但10个月以后，她收到了荷兰一位姑娘的来信。